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Correlated Emission Lasing in Harmonic Oscillators Coupled via a Single Three-Level Artificial Atom
Z H Peng1,2, Yu-Xi Liu3,4, J T Peltonen1
1Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan.
Physical Review Letters
|December 10, 2015
Summary
Researchers demonstrated two-mode correlated emission lasing using a superconducting artificial atom. This quantum system enables highly correlated light emissions, significantly surpassing the Schawlow-Townes limit for lasers.
Area of Science:
- Quantum optics
- Superconducting circuits
- Quantum information science
Background:
- Superconducting artificial atoms enable strong coupling with electromagnetic fields at the single-photon level.
- Resonance coupling of harmonic oscillators to a three-level atom transforms spontaneous emission into correlated dynamics.
Purpose of the Study:
- To experimentally demonstrate two-mode correlated emission lasing in harmonic oscillators.
- To showcase the control capabilities of a three-level superconducting quantum system (artificial atom) for coupling.
Main Methods:
- Utilizing a controllable three-level superconducting quantum system to couple two harmonic oscillators.
- Analyzing emission linewidths and phase diffusion to confirm correlation.
- Performing interference measurements on the emitted fields.
Main Results:
- Achieved two-mode correlated emission lasing with equally narrowed linewidths for different colors.
- Observed quenching of mutual phase diffusion between the two emission modes.
- Demonstrated mutual linewidths over 4 orders of magnitude narrower than the Schawlow-Townes limit.
- Interference patterns confirmed strong correlation between the two-mode fields.
Conclusions:
- The three-level superconducting artificial atom effectively couples harmonic oscillators to produce correlated emission.
- This system offers a novel platform for generating strongly correlated light with potential applications in quantum technologies.
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